The lost foam casting（LFC）liquid-liquid compound process was used to prepare the Al/Mg bimetallic castings by placing pure Al interlayer between AZ91Dand ZL101A.The microstructure and composition of the interface layer were analyzed by scanning electron microscopy（SEM）

energy dispersive spectroscopy（EDS）and X-ray diffractometer（XRD）.The results reveal that the pure Al interlayer can prevent successfully the liquid alloys mixing before it is melted

and then the melted interlayer presents metallurgical reaction with the liquid alloys

so AZ91Drealizes a desirable metallurgical bonding with ZL101Aand generates uniform reaction layers.The reaction layer near AZ91Dconsists of Mg

17

Al

12

andδ-Mg eutectic phase

while the reaction layer near ZL101Ais composed of continuously distributed Al

3

Mg

2

phase and granular Mg

2

Si phase.